ZWO Filter Drawer with M42 & M48 Threads (Gen 1) - For 2" Mounted Filters # FD-M42

Please note: This Gen 1 FD-M42 filter drawer has been discontinued and replaced by a new Gen 2 FD-M42 filter drawer. The new version is functionally identical to this Gen 1 version. Only the mechanical housing specifications have changed, with the result that the Gen 2 extra filter holder will not work with this item.

ZWO’s filter drawer makes it easy to insert and remove a 2" filter into your optical train between your camera and telescope. It uses a magnetic holder for a precise, secure, and repeatable fit. This device is perfect for imagers who want to quickly swap out filters without using large and heavy filter wheels.

The ZWO filter drawer holds a single mounted 2-inch filter with standard M48x0.75 threads. It includes an M42x0.75 external thread on the camera side, a M48x0.75 internal thread for the mounted filter itself, and a M48x0.75 internal thread on the telescope side. Also includes ZWO M48-M42 adapter that convert one side of the drawer so you can use it between two M42 threaded accessories or two M48 theaded accessories.  It also serves as a 21mm spacer to help achieve the correct backfocus distance without using a T2 extension ring. With a diameter of just 66mm, the ZWO filter drawer is also perfect for using in front of the optics of Hyperstar systems or Celestron RASA astrographs.